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D-1 W- LANOHAR-D. IAIRHEATVBR FOR FURNACES.

No'. 290,1 2. Patented 139 0.- 11, 1883,

WITNESSES Jvmwmiz N. PETERS. MW. WM DC- UNITED STATES PATENT ntros.

' vmoinw. BLANcHARuoF NE YQBK, N. r.

AIR-HEATER Foe FURNACES.

SPECIFICATION forming part of Letters Patent No. 290,172, dated December11, 1883. Application filed November 9, 1883. I (Namodell) To all whomit may concern:

Be it known that I, VIRGIL W. BLANOHARD, of New York, in the county ofNew York and State of New York, have invented certain new and usefulImprovements in Air-Heaters for Furnaces; and I do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form apart of this specification, in which--Figure l is a central vertical section of a chimney having myimprovement applied to it. Fig. 2 is a top View of one of the heaters.Fig. 3 is a vertical diametrical section through Fig. 2; and Fig. 4 is aside elevation of a chimney, an air-engine, and part of a furnace.

This invention relates to means for heating air to be supplied tofurnaces for. the purpose of increasing combustion therein; and it con-7 sists in a chimney which is provided with airheaters which areconstructed with exterior wings and removable diaphragms, and in aseries of cylinders having exterior webs and interior diaphragms,whereby air. can be forced downwardly in a zigzag course, while at thesame time the heated products of combustion are compelled to take anupward zigzag (or serpentine) course about the heaters in the chimney.

Before describing my invention, I will state that I have partlydescribed the same in an application for Letters Patent, which wasallowed on the 5th day of October, 1883, and numbered 78,978.

The chimney A communicates at its base with furnace, up through whichthe heated products of combustion are allowed to pass, and these heatedproducts are caused totake a serpentine course in their -upward flightby reason of the flanges, wings. or ribs B, which are formed on theexterior sides'of cylinders O. I have represented a number of cylindersinside of the uptake or chimney A, arranged" horizontally, each cylinderbeing connected with its fellow by a pipe, D, and also provided with acap, E, which is removable by loosening the nuts on the bolts a. Eachcylinder is also provided with a diaphragm, G, attached to itsrespective head or cap E. I show an exterior dead-air space, H, outsideof the chimney proper, in which the ends or heads of the air-heaters areinclosed, and I also show in the annexed drawings a wall, H, throughwhich are openings 12, provided with doors a, for the purpose ofaffording convenient access to the heads of the air heaters for theremoval of the. diaphragms when itis necessary to do so.

J designates an air-forcing engine, which may be the well-known rotaryblower, or it may be constructed in any suitable manner. Thisair-forcing engine communicates with the topmost air-heater by means ofapipe, K, and the lowermost air-heater communicates with a furnace bymeans of a pipe, L.

Now, it will be observed from the above description that the ascendingproducts of combustion take a zigzag course about the several heaters inthe chimney A, while the descending air is caused to circulate throughthe several heaters in a similar course by reason of the diaphragmstherein, which latter touch the alternate ends of the cylinders.

It will also be observed that the front ends of the air-heaters are in adead-air chamber, and that the rear portions thereof are in the chimneysubjected to the heat rising through this chimney, and also that theair-heaters are free to expand and contract, because they are sustainedin position only at one end, the opposite end being free.

Having described my invention, I claim- 1. The combination, with achimney or up? take, of air-heaters arranged therein having externalflanges or wings for causing a serpentine deflection of course of theascending currents of heat, and diaphragms in said air-heaters arrangedto cause a serpentine course of the descending currents of air,substantially as described.

2. The combination of removable diaphragms with air-heaters, constructedsubstantially as'shown, arranged in a chimney substantially asdescribed. 3. The combination of diaphragms and flanged or ribbedair-heaters with a chimney or uptake, substantially as described.

4. The combination of an air forcing engine with air-heaters providedwith external flanges and internal diaphragms, a chimney, and an outletat the lowest'air-heater, substantially asdescribed.

5. The combination of a chimney, having a dead-air space,withair-heaters and apertures for the removal of the heads of said heaters,substantially as described.

5 6. An air-heater consisting of a cylinder or bod externally flanged,and a head having a diaphragm applied to it, substantially as described7. The combination of one or more air-heatro ers, flanged as described,a removable diahragm, a chimney in which the air-heaters re arranged, adead-air space outside of the chimney proper, and apertures through theouter wall of said dead-air space, provided with 15 doors, substantiallyas described.

8. The combination of an air-heating vessel, having external flanges orribs, with a head for this vessel, having a diaphragm applied to it, achimney, and a dead-air space, and the intermediate wall for sustainingthe said ves- 2o sel, substantially as described.

In testimony that I claim the foregoing a my own I afiix my signature inpresence of two witnesses.

VIRGIL XV. BLANCI-IARD.

Witnesses:

W. R. KEYWORTH, F. O. MCOLEARY.

